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A 35 in place of a 30 will cause slightly higher starting and running currents, slightly more torque. No problem in a temporary situation. Might shorten life a little if left in, but not sure that it would even do that.

Get one of those Turbo 200 capacitors on your truck and save it for those really oddball dual run caps. It can be used to replace a single run cap too.
They are pricy, so you have to charge more for them, but it will save you a trip to the supply house.
I just wish the Turbo 200 would go up to 80µf.

Originally posted by Toolpusher I'll bet that looked like a time bomb strap to the undercarrage.

No one has said what will happen if the higher mfd is used and not changed.

The motor or compressor will draw more current than it normally would, and its life will be shortened.....the higher the cap value, the worse the effect....too high (several times the desired) of a value, and you'll be emulating a hard start cap that doesn't switch out and stays in circuit....after all that's all a hard start really is: a temporary boost in the run capacitance, right?

BTW, a **very good** quality cap has at least a 5% variation in its stated capacitance rating (the standard quality smaller caps, like the type used on circuit boards, can vary by 20%, the "good" quality 10%). A 30-40 deg temperature change can add a few more percent...age can also cause variation in capacitance as the dielectric dries out.....bottom line: you really don't know what it is, unless you measure it!!!!